DAY6 (데이식스) Featured KOREAN DAY6 – I’m Serious (장난 아닌데) 장난 아닌데 jangnan aninde “I’m Serious” [Single] Every DAY6 April 2017.04.06 Jae, Sungjin, Young K, Wonpil, Dowoon Lyrics/작사: Young K, 성진,…